Phase 8: Add error handling polish

- Dry-run continues even without API access
- Shows planned operations from metadata alone
- Better health check handling for offline testing

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

outline_import.py

@@ -690,15 +690,21 @@ class OutlineImporter:
             print("[DRY RUN] No changes will be made")
             print()
 
-        # Health check
-        if not self.health_check():
-            logger.error("Import aborted due to failed health check")
-            return
+        # Health check (skip in dry-run mode if it fails)
+        health_ok = self.health_check()
+        if not health_ok:
+            if self.dry_run:
+                print("  (continuing in dry-run mode without API)")
+                print()
+            else:
+                logger.error("Import aborted due to failed health check")
+                return
+        else:
+            print()
 
-        print()
-
-        # Get existing collections
-        self._get_collections()
+        # Get existing collections (skip in dry-run if health check failed)
+        if health_ok:
+            self._get_collections()
 
         # Get source collections
         source_collections = self.get_source_collections()